Additional data from Flightradar24 ADS-B network show that vertical speed was unstable after take off.

Take off 05:38:18 UTC
Last position received by FR24 at 05:41:02 UTC

Please note that Addis Ababa airport is located at 7,625 feet AMSL. pic.twitter.com/Uyvfp1x9Xb

— Flightradar24 (@flightradar24) March 10, 2019